﻿* {
    /* 初始化 */
    margin: 0;
    padding: 0;
}

body {
    /* 100%窗口高度 */
    height: 100vh;
    /* 弹性布局 水平+垂直居中 */
    display: flex;
    justify-content: center;
    align-items: center;
    /* 渐变背景 */
    background: linear-gradient(200deg,#ffffce,#fff3f5);
}

.container {
    background-color: #fff;
    width: 650px;
    height: 415px;
    border-radius: 5px;
    /* 阴影 */
    box-shadow: 5px 5px 5px rgba(0,0,0,0.1);
    /* 相对定位 */
    position: relative;
}

.form-box {
    /* 绝对定位 */
    position: absolute;
    background-color: #ced0b4;
    width: 350px;
    height: 415px;
    border-radius: 5px;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
    /* 动画过渡 加速后减速 */
    transition: 0.5s ease-in-out;
}

.register-box, .login-box {
    /* 弹性布局 垂直排列 */
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.hidden {
    display: none;
    transition: 0.5s;
}

h1 {
    text-align: center;
    margin-bottom: 25px;
    /* 大写 */
    text-transform: uppercase;
    color: #fff;
    /* 字间距 */
    letter-spacing: 5px;
}

input {
    background-color: transparent;
    width: 70%;
    color: #fff;
    border: none;
    /* 下边框样式 */
    border-bottom: 1px solid rgba(255,255,255,0.4);
    padding: 10px 0;
    text-indent: 10px;
    margin: 8px 0;
    font-size: 14px;
    letter-spacing: 2px;
}

    input::placeholder {
        color: #fff;
    }

    input:focus {
        color: #a262ad;
        outline: none;
        border-bottom: 1px solid #a262ad80;
        transition: 0.5s;
    }

        input:focus::placeholder {
            opacity: 0;
        }

.but {
    width: 70%;
    margin-top: 35px;
    background-color: #f6f6f6;
    outline: none;
    border-radius: 8px;
    padding: 13px;
    color: #a2ad9f;
    letter-spacing: 2px;
    border: none;
    cursor: pointer;
}

    .but:hover {
        background-color: #a2ad88;
        color: #f6f6f6;
        transition: background-color 0.5s ease;
    }

.con-box {
    width: 50%;
    /* 弹性布局 垂直排列 居中 */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    /* 绝对定位 居中 */
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

    .con-box.left {
        left: -2%;
    }

    .con-box.right {
        right: -2%;
    }

    .con-box h2 {
        color: #8e9aaf;
        font-size: 25px;
        font-weight: bold;
        letter-spacing: 3px;
        text-align: center;
        margin-bottom: 4px;
    }

    .con-box p {
        font-size: 12px;
        letter-spacing: 2px;
        color: #8e9aaf;
        text-align: center;
    }

    .con-box span {
        color: #d3b7d8;
    }

    .con-box img {
        width: 150px;
        height: 150px;
        opacity: 0.9;
        margin: 40px 0;
    }

    .con-box button {
        margin-top: 3%;
        background-color: #fff;
        color: #a262ad;
        border: 1px solid #d3b7d8;
        padding: 6px 10px;
        border-radius: 5px;
        letter-spacing: 1px;
        outline: none;
        cursor: pointer;
    }

        .con-box button:hover {
            background-color: #d3b7d8;
            color: #fff;
        }

作者：自我开发中 https://www.bilibili.com/read/cv17417718 出处：bilibili
